Omron CQM1H-SCB41 operation manual RS-422 4-wire Connections, RS-485 2-wire Connections

CompoWay/F Master Protocol Appendix B

RS-422 4-wire Connections

•RS-422 connections can be one-to-one, or one-to-N when a 3G2A9-AL001 Link Adapter is used. A maximum of 32 Serial Communications Boards can be connected in one-to-N systems.

•The total cable length can be 500 m max.

•Use shielded, twisted-pair cable.

•Be sure to turn ON the terminating resistance switches at the device at each end of the transmission line.

Serial
Communications		Intelligent Signal
Board	RS-422
			Processor
				SN751177N or equivalent
	Abbreviation
				Terminal
		Pin	Ab-	220 Ω block switch
	Shell	No.	brevi-
			ation
	6

8

1

2

*1: Set the 2-/4-wire switch to the 4-wire setting.

*2: Turn ON the terminat- ing resistance switch.

220 Ω

Shield

The terminator (220 Ω ) is set with the terminal block switch.

RS-485 2-wire Connections

•RS-485 connections can be one-to-one or one-to-N. A maximum of 32 Serial Communications Boards can be connected in one-to-N systems.

•The total cable length can be 500 m max.

•Use shielded, twisted-pair cable.

•Be sure to turn ON the terminator switches only in the devices at each end of the transmission line.

Serial

Communications

Board RS-485

Abbreviation

Shell 1 2

Shield

*1: Set the 2-/4-wire switch to the 2-wire setting.

*2: Turn ON the terminat- ing resistance switch.

Intelligent Signal Processor			SN751177N or equivalent
Turn OFF all terminal block
switches except at the end-station.
		Terminal
Termi- Ab-	220 Ω	block
		switch
nal brevi-

ation

+

Intelligent Signal

Processor end-station

Termi-	Ab-	Terminal
		220 Ω block switch ON
nal	brevi-
	ation
	+
		Terminal block switch ON at the end station.

Shield

Note SYSMAC BUS Wired Remote I/O devices cannot be connected.

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